Safety, Tolerability and Efficacy Against Controlled Human Malaria Infection of PfSPZ-LARC2 Vaccine in Malaria-naïve Adults
brief summary
This is a first-in-human, randomized, double-blind, placebo-controlled Phase 1 trial of Plasmodium falciparum (Pf) sporozoite (SPZ) late-arresting replication-competent (LARC) malaria vaccine (PfSPZ-LARC2 Vaccine) administered to healthy, malaria-naive study participants in Germany by direct venous inoculation (DVI) to determine safety, tolerability, and vaccine efficacy (VE) against controlled human malaria infection (CHMI). PfSPZ-LARC2 Vaccine contains a deletion of two genes, the Mei2 and LINUP genes, and undergoes developmental arrest in the late liver stages without releasing merozoites into the blood stream (blood stage parasites). The primary objective of the study is to assess the safety and tolerability of administration of PfSPZ-LARC2 Vaccine, with special attention to the adequacy of attenuation, in the intention-to-treat (ITT) population. Studies of PfSPZ-LARC2 in FRG mice indicate that Plasmodium falciparum LARC2 parasites halt development in their late liver life cycle stages and do not generate viable merozoites able to initiate blood stage infection. Attenuation in this assay system has been a good predictor of attenuation in humans, indicating that blood stage infection in this trial of PfSPZ-LARC2 Vaccine will not occur. Recent data from Leiden University where a Mei2 single deletion parasite was administered to human participants by mosquito bite confirmed that removing this single gene by itself confers complete attenuation. PfSPZ-LARC2 Vaccine has both Mei2 and LINUP deleted, so it should be completely attenuated. In order to better understand what side effects might look like, on the small chance that PfSPZ-LARC2 Vaccine is not adequately attenuated, it is important to briefly describe the safety data from studies of PfSPZ-CVac (chloroquine), a whole Plasmodium falciparum sporozoite (PfSPZ) immunization approach that uses cGMP produced, aseptic, purified, cryopreserved, non-attenuated, fully infectious PfSPZ administered under chloroquine cover. This is because the safety and tolerability data from PfSPZ-CVac represent a worst case scenario for what could happen with PfSPZ-LARC2 Vaccine with respect to safety and tolerability, as recipients of PfSPZ-CVac always have blood stage infection after the first immunization, even if small doses are administered. The current standard regimen in malaria-naive adults receiving PfSPZ-CVac is 2.0x10\^5 PfSPZ, 62.5-fold higher than the 100% infective dose for controlled human malaria infection (CHMI) in malaria-naive individuals, which is 3.2x10\^3 PfSPZ. The blood stage infection is detectable by ultrasensitive qPCR on days 7 to 9 after PfSPZ administration and then clears due to the schizonticidal action of chloroquine. Doses used for PfSPZ-CVac have been escalated to as high as 2x10\^5 PfSPZ in malaria-naive adults and 4.0x10\^5 PfSPZ in malaria-exposed adults, and are generally well tolerated; however, some individuals experienced symptoms of malaria on days 7 and 8 during the period of transient parasitemia, including Grade 3 adverse events, which can largely be prevented by the administration of drugs such as ibuprofen, naproxen or acetaminophen starting the morning of day 7 or after symptoms appear. Once the first dose of 2x10\^5 PfSPZ is administered, immunity develops rapidly, and when the second and third doses are administered at 4-week intervals, there have been no Grade 3 adverse events recorded even in the absence of ibuprofen, naproxen or acetaminophen. These data from PfSPZ-CVac are relevant because they represent a possible worst-case scenario for PfSPZ-LARC2 Vaccine. In other words, even if the attenuation of PfSPZ-LARC2 parasites is not realized in vivo, the density of parasitemia should not be any higher nor the tolerability any worse than what has already been experienced with non-attenuated PfSPZ-CVac administered at the same PfSPZ dose. On the contrary, we would expect the percentage of participants with a blood stage infection to be lower following PfSPZ-LARC2 Vaccine administration due to its intrinsic attenuation than with non-attenuated PfSPZ, and in individuals with a blood stage infection, the numbers of parasites released from the liver to be lower than with non-attenuated PfSPZ. This will be the first assessment of PfSPZ-LARC2 Vaccine in humans. While we anticipate that vaccine efficacy (VE) in humans will be similar to that of PfSPZ-CVac, we have no data at this point, and it will be important to collect these comparative data. However, in the Leiden trial, where the Mei2 single knockout called GA2 was administered by mosquito bite, there was good protection after 3 immunizations by exposure to 50 infected mosquitoes (8/9 participants protected against homologous CHMI using 5 infected mosquitoes).
detailed description
This is a first-in-humans, randomized, double-blind, placebo-controlled, single-center Phase 1 clinical trial in two parts, with the performance of Part B conditional on the outcome of Part A.
In Part A, eligible healthy participants (N = 5) will be enrolled as a sentinel group that receives a single dose of 2x105 PfSPZ of PfSPZ-LARC2 Vaccine by direct venous inoculation (DVI) on Day 1 and will be followed for 28 days (to Day 29) to identify any breakthrough infections. If there are no breakthrough infections by Day 29, the main cohort (n = 24) will undergo immunization. Participants in the verum group (n = 18) of the main cohort will also receive 2x10\^5 PfSPZ of PfSPZ-LARC2 Vaccine per immunization dose by DVI. The blinded control group (n = 6) of the main cohort will receive normal saline as placebo, also by DVI. All of the participants in the main cohort will progress through a 3-dose immunization regimen with 2x10\^5 PfSPZ of PfSPZ-LARC2 Vaccine or normal saline administered on Days 1, 6 and 29.
Participants in both the sentinel group and main cohort will be followed up for parasitemia and adverse events after immunization. After the first immunization on Day 1 in the sentinel group, qPCR will be performed to monitor for P. falciparum blood stage infections daily from Day 7 (day +6) to Day 21 (day +20) and then every other day to Day 29 (day +28) when terminal treatment begins. Thick blood smears (TBS) to monitor for blood stage parasitemia by microscopy will be made on the days that qPCR is performed and read in real-time. TBS will also be done whenever the physician investigator requests a rapid diagnostic test (for whatever reason).
If blood stage parasitemia is not detected during 28 days of follow-up of the sentinel group, the participants will be treated presumptively under direct observation with a three day regimen of atovaquone-proguanil or artemether-lumefantrine), to assure malaria-free status at the end of their participation in the trial.
As soon as the Day 29 qPCR of the sentinel volunteers is determined to be negative, the 24 participants of the main cohort may receive their first immunization with PfSPZ-LARC2 Vaccine or placebo. Following a first immunization on Day 1, the main cohort will receive a second immunization five days later, on Day 6. The qPCR follow-up for the first immunization begins on the next day (Day 7) and will be performed daily from Day 7 (day +6) to Day 12 (day +11), then every other day to Day 22 (day +21) and then weeky thereafter until four weeks after the third immunization, noting that the chance of breakthrough should be much reduced after the first and second immunizations due to the development of immunity. TBS will be performed concurrently as described above and read in real-time.